It appears the server is dropping socket connections and we are trying to find out why. Unfortunately, being the weekend and a holiday coming up, getting all the people and information together may take us a couple more days.
At this point, if you are still trying to get some games in, I would suggest exiting Live and reconnecting after each game. This won't guarantee it won't drop the connection during a game, but resetting your connection may help some.
We will let you know when we find the problem and get it fixed. Sorry for the inconvenience.